18823841 has 2 divisors, whose sum is σ = 18823842. Its totient is φ = 18823840.

The previous prime is 18823799. The next prime is 18823843. The reversal of 18823841 is 14832881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18190225 + 633616 = 4265^2 + 796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18823841 is a prime.

Together with 18823843, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18823843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9411920 + 9411921.

It is an arithmetic number, because the mean of its divisors is an integer number (9411921).

Almost surely, 2^18823841 is an apocalyptic number.

It is an amenable number.

18823841 is a deficient number, since it is larger than the sum of its proper divisors (1).

18823841 is an equidigital number, since it uses as much as digits as its factorization.

18823841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 35.

The square root of 18823841 is about 4338.6450649944. The cubic root of 18823841 is about 266.0129311369.

The spelling of 18823841 in words is "eighteen million, eight hundred twenty-three thousand, eight hundred forty-one".